Centrifugal machine.



J. SELWIG.

GBNTRIFUGAL MACHINE. APPLIUATION FILED Nov. 2s. 1904.

Patented Dec. 3, 1912.

' vrapid motion for bein removed. Fig. 4 is Brunswick, in the purpose ofbringing mi' anni r smfrnspgrnnr oilnic 13;

JOHANNES sELwIo, 'or BRUNSWICK, GERMANY.

specification of Letters Patent. Application led November 23, 1904.Serial No'. 34,005.

Patente-a nee. a, 1912.

` To all 'whom t mcy concern Be it known that I, JOHANNES SELWIG, asubject of the German Empero-r, residing at German Empire, PetrithorwallQ4, have invented a new and useful Improvement in Centrifugal Machines,of which the following is a specification.

My invention relates-to improvements in apparatus hitherto employed fo-rproducing a fluid. circulation rin a centrifugal machine' with a casingclosed at the -bottorn,for the. the substance contained; 1n theperforated basket of the machine inv yintense and repeated contact withthe iuidl In the accompanying drawing,'Figure 1 a view, mainly invertical section,

showing4 my improvement. Fig. 2 is a similary section of a,modification. Fig. 3- is a plan, partly in section, of Fig. i2, certainportionsa view, chiefly in vertical sectionshowing a further modifica-`tical section of a centrifu tion of my invention. Fig. 5 is a planview, partly inl section, Aof Fig, 4, certain parts being. removed. Fig.'6 is a 'fragmentary view, 1n vertical section showing a modification. nv

Slmilar letters of reference indicate s1m1- lair parts inthe respectivefigures. A

Referring more especially to Fig. 1, a veral machineV is fluid circulaof my invenby 'slow shown, having an 'improve tion apparatus." In th1sform tion the 'Huid-circulation' is caused rotation of the basket.

v A is the cylindrical casing of the-machine, which is closed below sothat it may be filled withany Huid.

B is a perforated basket which is charged with the vsubstance undertreatment, the

' ,basket being carried byv a` conical dome b l fixed to the top of thecentral revolves infstationar'y bearings, and is itd shaftY c whichbelow with a driving pulley (not shown) for putting the machine 1nmotion.

lcasing and' the The neck-bearing e 'of the shaft c is placed 1n aconical bracket 'f `part-lyfoccupying the interior of the dome b, and,forming the center-piece of the bottom g of the casing A, the

upper edge ofl said basket lprojecting above the surface of the fluidwhen the casing is filled therewith. Between the walls of the conicaldome band the bracket f is left suiii-J cient space for-the assage ofthe circulatin fluid, and the waii vi ed with a number of perforations bfor the direct connection'of lthe interior of the f 'dome with theinterior' of the perforated vbasket B.'

The interior Hof the dome b 'is separated 70 between the bottom g of thebottom of. the basket B, as shown for example in'Fig. 1, by an annularrimnm connected below with the bottom of fromv the space the basket, therim m being surrounded by a corresponding annular r1m n projecting overashoulder on the bottom g of the casing.

As the im m revbives with the basket B,

it must not touch the rim n, but a small space is left betweenthem. Forreturning the fluid to the interior of the dome b the latter isconnected in a suitable way with the interior of the casing A at itscircumference, for

instance as shown in Fig. 1, by one or more pipes pleading from theoutside wall of the casing to two knee-shaped conduits t communicatingwith thel interior of the dome b;

or as show-nin Figs. 2'and 3, by four conduits g leading under lthebottom of the of the bracketf to the 4 and 5 represent roposed purpose,

casing from the foot wall of the casing.' Figs. a modication serving the'in' whichvis used an annu ar metal-plate 1',

which is less than the exterior diameterof the exterior dian eter of thecasing, the plate 1' being fixed tothe bottom g of the' latter, some4spaee being left between the bottom q and the plate r for the assage oflthe fluid.

The inner edge ofthe p ate r, which is bent upward, borders upon theannular rim m so that the interior of the dome b on the one. hand isseparated ly the plate r from the space under the basket, while on theother hand itfis directly connected by thespace between the'bottom g andthe plate with theinterior of the casing A near its wall.-

Now. it is clear that -when the casing is 'filled to any height-.with afluid, whether this iiuid rotate within the casing or not, 110

ls of the dome are pro- 65 casin the pressure of the fluidV within thedome b at a certain height will be equal to the ressure of the iuid atthe circumference o the' casing at 'the same height, as the spacescommunicate one with the other in the above 4described manner. -When thebasket B is at rest, and with it the iuid contained in the casing Af.the surface of the iiuid will form a horizontal plane, and for thisreason the Huid-pressure at a certain height will be the samethroughout; whereas, when the basket rotates, andv with it the iiudcontainedin it and the space surrounding it the surface of-the iuidwillsink near the,- center yof the casing and rise at the circumferenceathereof. Consequently the iuid pressure in the center o the basketwillbe less than that near the circumference of the Now this -greater*uid-pressure is trans erred in" the above described way -to `theinterior ofthe dome b, and as it exceeds the iuidressure Within the'4basket, the

. huid will" ow out ofthe interior of the dome. .b through theperforations b". into the interior o the basket which it` traversesV ina v.radial direction.v Then it willpassthe exl terior 'perforated wallof the -basket Band under the space surrounding it, whence `it 'will runback .through the pipes, vconduits ori any other existin passages' .tothe intellor of the dome by. ceoraingiy he sind win circulatefthroughthe basket B and the sub f stance contained therein, and thiscirculation will 'continue-as-long as the basket Ifotates.- 'Thestrength of the circulation will depend upon Vthe number of revolutionsofI -the'basket.

For preventing the'circulating Huid from.

owing over the upper edge of thecasing A ywhen the basket B 1s rapidlyrotated, a-ho1i Az'ontalvcover amaybe fixed' (see Fig. 6)l above Y thebasket -tothe wall of the casing, under gvvhichv cover the iuid maycirculate. v e cover, afsection only of which .is shown, is

a perforated. dat plate, by meansof which the force.- ofthe Huid passingtherethrough is 'broken," the iiuid beingV therefore keptfrom..dasfhing`.0ver theedges o f the casing A. As this will havenoinfluence uponthe Huid-pressure within the the circula; l

Arated basket having a 'laterally roaceo tion will take place in thesame way as in an open casing.

The advantages of .the fluid-circulation arrangement forming the subjectof this invention are that it takes 'place through met under the surfaceof the uid, and that it is immaterial whether 'the basket is lledwithluid upto the top or to any other` height.

Having thus described my invention, I`

claim:

1. Ina centrifugal machine, the "combination of a casing having a bottomprovided Isaid rims, a driving shaft passing through the bracket andsecured to the dome of t e basket, and means whereby communication ishad between the 'interior of the casing and ghe lnteriorofthe dome,substantially as set ort L 2. In a 'centriiugal' machine, the combination' of acasing having a bottom provided' with an annular rim n, alaterally` perforated basket -having a laterally rfcrated central domesecured thereto an provided with an annular :rim m, the-:latter beingconcentric with and adjacent to said annular .rim n, a space being leftbetween the d ome and the bracket, and Ispaces being left between saidbasket and the casing and between the said rims, a driving shaft passing.through the bracket and secured to the dome of the basket, an annularcover aixed to the casing above the' top of the basket, and

Ameans .whereby-communication is'had between the interior of the casingand-the interior oftle dome, substantially as set forth; I* @i Y fJOHANNES vsnm/ie,V

.Witnesseszf i 'CARL BoEHmn,

.exp-,flacos KRNER. ,I

